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Open AccessArticle

Impact of Natural Ventilation on the Thermal and Energy Performance of Buildings in a Mediterranean Climate

1
CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
2
Department of Mechanical Engineering (DEM), CINEA, Escola Superior de Tecnologia de Setúbal, Instituto Politécnico de Setúbal, 2914-761 Setúbal, Portugal
*
Author to whom correspondence should be addressed.
Buildings 2019, 9(5), 123; https://doi.org/10.3390/buildings9050123
Received: 8 April 2019 / Revised: 8 May 2019 / Accepted: 10 May 2019 / Published: 15 May 2019
Natural ventilation plays an important role on the thermal and energy performance of a building. The present study aims to analyze the natural ventilation conditions of a dwelling in a Mediterranean climate and their impacts on the thermal and energy performance using an advanced building energy simulation tool. Several multi-zone simulations were carried out. In the summer, the simulations were performed under free-floating conditions, whereas in the winter they were carried out under controlled temperature conditions. In the summer, ventilation scenarios with windows opened during certain periods of time and with or without permanent openings in the facades were analyzed. The existence of permanent openings proved to be an important factor of temperature control by lowering the average indoor zone temperatures during the day. Cross-ventilation also showed to be effective. In the winter, we simulated the existence or absence of permanent openings for room ventilation and their surface area. The results showed that the stack effect plays an important role in the ventilation and that in general it outperforms the wind effect. Sizing permanent openings according to the standard guidelines proved to be adequate in providing the expected ventilation rates on an average basis. View Full-Text
Keywords: natural ventilation; stack effect; cross ventilation; night ventilation; free-floating conditions; controlled temperature conditions natural ventilation; stack effect; cross ventilation; night ventilation; free-floating conditions; controlled temperature conditions
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MDPI and ACS Style

Moret Rodrigues, A.; Santos, M.; Gomes, M.G.; Duarte, R. Impact of Natural Ventilation on the Thermal and Energy Performance of Buildings in a Mediterranean Climate. Buildings 2019, 9, 123.

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